Metal Refininig Converter - Exporter, Manufacturer & Supplier, Kalol, India

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Product Code : 06

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Product Specification

It is identified as one of the key metallurgical tool for economical manufacturing of stainless steel.

Features

Suitable for production of all grades of Stainless Steel.
Process is highly predictable and reproducible.
Gas mixing station is microprocessor based with a computer station that promotes fast decarburization and reduction.
High recoveries of alloying elements like Cr, Mn.
Lower gases and non-metallic inclusions.
Accurate flow measurement compensated for pressure & temperature variation helps reduce the use of ferrosilicon & oxygen.
UPS backup in case of power failure.
Overall process display & recording enables modification of process parameters.
Online print-out of recordable data of gas flow/pressure helps in monitoring, comparing & costing.
Top lance helps reduce oxidation time.

Principle of AOD converter operation
1. In AOD Operation, dilution of the oxygen by the inert gas lowers the partial pressure of carbon monoxide. This favours carbon removal and diminishes metallic oxidation.

2. There are three stages for Stainless Steel production in AOD Vessel.

Decarburization

Reduction/Desulphurization
Trimming

Decarburization
In the Decarburization phase the oxygen & inert gas ratio varies as following

Ist Blow 3:1 (carbon reduces to a level of 0.35%)
IInd Blow 1:1 (carbon reduces to a level of 0.15%)
IIIrd Blow 1:3 (carbon reduces to a level of 0.05%)

All the additions are made during decarburization so as to obtain the final composition.

Reduction/Desulphurization
For reduction of metallic oxides from slag, the reduction additions like ferro-silicon & aluminium are added and the bath is stirred with inert gas.

A good desulphurization takes place with the formation of high basicity slag & reduction of oxygen potential in the bath. Sulphur can be reduced from 0.03% to 0.003%.

Trimming
To achieve the final specification small additions are made before tapping.

Benefits

Degassing due to vigorous stirring of bath by blowing of inert gas & generation of carbon monoxide gas during decarburization.
Low amount of residual oxygen, hydrogen and nitrogen.
High metallic yield.
Achieving lower carbon specification without excessive metallic oxidation.

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